Concrete Screw Guardrail Posts for Immediate Roadway Mounting
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Solution Overview
Problem
Existing vehicle retention systems on road surfaces require time-consuming curing processes and are not immediately resilient, as they rely on non-positive adhesive bonds that take time to set, making them less effective for immediate mounting and potentially prone to corrosion and moisture issues.
Innovation Solution
A vehicle retention system utilizing a concrete screw with a frost-resistant and waterproof adhesive, where the screw is inserted into a borehole with an inner diameter smaller than the screw's outer diameter, ensuring a positive fastening and sealing against moisture, allowing for immediate resilience and easy repair or replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If asphalt screws are used with composite mass in a borehole, then the post can be attached to the road surface, but the attachment requires curing time and is not immediately resilient
Solution Approach 1:
The patent replaces the chemical bonding mechanism (composite mass requiring curing) with a mechanical fastening mechanism (concrete screw with threads that cut into the borehole walls). The screw creates immediate mechanical interlocking through its external threads engaging with the borehole inner circumferential surface, eliminating the need for curing time and providing immediate attachment resilience.
Solution Approach 2:
The concrete screw is divided into functional segments: a threaded portion for mechanical engagement with the borehole, a sealing portion for moisture protection, and a head portion for mounting the guide wave. This segmentation allows the fastening and sealing functions to be performed simultaneously during installation, providing immediate resilience without curing delays.
2Reliability
If posts are embedded in the ground and rammed, then secure attachment is achieved, but the installation process is time-consuming and complex
Solution Approach 1:
The patent replaces the complex ramming and embedding process with a simple screwing operation. The concrete screw with external threads cuts into the borehole walls during installation, creating immediate mechanical interlocking without requiring heavy equipment or multiple workers for ramming, thus significantly improving installation speed while maintaining attachment security.
Solution Approach 2:
The borehole is pre-drilled to the correct dimensions before screw installation, and the concrete screw is designed with pre-formed external threads that will automatically engage with the borehole walls during screwing. This preliminary preparation eliminates the need for time-consuming on-site ramming and embedding operations, boosting productivity while ensuring reliable attachment.
3Ease of operation
If the borehole inner diameter is made larger to accommodate the screw, then easier installation is achieved, but the fastening strength is reduced
Solution Approach 1:
The patent optimizes the borehole inner diameter to be slightly smaller than the outer diameter of the screw's external threads. This parameter change ensures that when the screw is installed, the threads cut into the borehole walls, creating strong mechanical interlocking. The precise dimensional relationship between the borehole and screw parameters maximizes both installation ease and fastening strength simultaneously.
Solution Approach 2:
The concrete screw features localized thread geometry with specific pitch and depth designed to cut effectively into the borehole walls. The external threads are concentrated in specific zones along the screw length, providing enhanced fastening strength at critical locations while maintaining overall ease of installation through the optimized thread configuration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides a fast, resilient, and corrosion-resistant mounting solution that is immediately functional and simplifies repairs by allowing for easy removal and reinstallation of concrete screws, eliminating the need for re-drilling and curing processes.
Implementation Method 1
integration of a frost-resistant and waterproof adhesive attached. During the tightening process, a part of the adhesive at the upper end of the borehole occurs and seals both the concrete screw in the borehole
Data Source
Figure 1
Figure 2~3
AI summary
The present invention relates to a vehicle restraint system (1) for arranging a roadway which has posts (3) fixed to a ground and guardrails attached to the posts (3), which is characterized in that the posts (3) are fastened by means of at least one concrete screw (6) in an undersized borehole (7) by incorporating a frost-resistant and waterproof adhesive (11), such that an excess of the adhesive (11) between a mounting plate (13) of the post (3) and the upper edge (10) of the borehole (7) has escaped and seals.